Fast-positioning device for assembling blade brackets to a motor housing of a ceiling fan

ABSTRACT

A fast-positioning device for assembling blade brackets to a motor housing of a ceiling fan includes a motor housing and plural blade brackets. The motor housing has the circumference of its underside divided in to equal parts respectively formed thereon with a positioning plate protruding downward and respectively formed with a long side and a short side. The long sides of the positioning plates are radially and orderly arranged, based on the center of the motor housing. Each blade bracket has the corresponding side of the motor housing formed with a connecting portion having its end cut with at least one notch to be horizontally and directly fitted on the positioning plate of the motor housing without obstructing sight line, enabling the blade brackets to be quickly positioned on the motor housing and their locking locations to be completely aligned to each other.

BACKGROUND OF THE INVENTION

1. Field of the Invention

This invention relates to a ceiling fan, particularly to one provided with a fast-positioning device for quickly assembling blade brackets to a motor housing of a ceiling fan.

2. Description of the Prior Art

Conventionally, blade brackets are assembled on the motor housing of a ceiling fan by means of screws and threaded holes for preventing the blade brackets disengaging from the motor housing, as disclosed in a U.S. Pat. No. 6,210,117, titled “DEVICE FOR CONNECTING A FAN BLADE TO A CEILING FAN MOTOR”. The motor housing of the conventional ceiling fan has its underside bored with a plurality of fixing holes spaced apart equidistantly along the circumference, and each fixing hole has its opposite sides respectively bored with a threaded hole, while the blade brackets of the conventional ceiling fan are respectively provided with a fixing pin and two through holes respectively corresponding to the fixing hole and the threaded holes of the motor housing. Thus the blade brackets can be firmly assembled on the underside of the motor housing by inserting the fixing pin of the blade bracket into the fixing hole of the motor housing and having two screws respectively inserted through the through holes of the blade bracket and secured with the threaded hole of the motor housing.

To assemble the conventional ceiling fan on a ceiling, firstly, the motor housing of the ceiling fan is firmly fixed on the underside of a ceiling and then the blade bracket has its fixing pin aligned to and inserted in the fixing hole of the motor housing. Next, the blade bracket, having its fixing pin serving as a pivot, is slightly turned leftward or rightward to have its opposite through holes respectively aligned to the two threaded holes of the motor housing. Then, two screws are respectively inserted through the through holes and secured in the threaded holes to finish assembling the blade bracket on the motor housing. However, since the blade bracket is assembled from under the motor housing, therefore, when the blade bracket is moved close to the underside of the motor housing, the blade bracket may obstruct the fixing hole of the motor housing and thus disable a worker to see clear the accurate location of the fixing hole and insert the fixing pin in the fixing hole quickly, increasing difficulty and lowering efficiency in assembling.

SUMMARY OF THE INVENTION

The objective of this invention is to offer a fast-positioning device for assembling blade brackets to a motor housing of a ceiling fan, which includes a motor housing and a plurality of blade brackets. The motor housing has the circumference of its underside divided into plural equal parts respectively formed thereon with a positioning plate protruding downward. The positioning plates are respectively formed with a long side and a short side, and the long sides are radially and orderly arranged with respect to the center of the motor housing. Each blade bracket has the corresponding side to the motor housing provided with a connecting portion having its front end cut with at least one positioning notch. In assembling, the blade bracket has its positioning notch transversely and horizontally moved forward and directly fitted on the positioning plate of the motor housing; therefore, in the course of assembling, the locations of both the positioning notch of the blade bracket and the positioning plate of the motor housing can be seen clearly not to obstruct worker's sight line at all. By so designing, the positioning notch of the blade bracket can be quickly fitted with the positioning plate of the motor housing, and the corresponding locking positions of the motor housing and the blade bracket can be completely aligned to each other; therefore, the blade brackets can be quickly assembled to the motor housing of a ceiling fan.

BRIEF DESCRIPTION OF DRAWINGS

This invention will be better understood by referring to the accompanying drawings, wherein:

FIG. 1 is an exploded perspective view of a first preferred embodiment a fast-positioning device for assembling blade brackets to a motor housing of a ceiling fan in the present invention;

FIG. 2 is a perspective view of the first preferred embodiment of the fast-positioning device for assembling blade brackets to a motor housing of a ceiling fan in the present invention;

FIG. 3 is a bottom view of the first preferred embodiment of the fast-positioning device for assembling blade brackets to a motor housing of a ceiling fan in the present invention;

FIG. 4 is an exploded plane view of a second preferred embodiment of a fast-positioning device for assembling blade brackets to a motor housing of a ceiling fan in the present invention; and

FIG. 5 is an exploded plane view of a third preferred embodiment of a fast-positioning device for assembling blade brackets to a motor housing of a ceiling fan in the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

A first preferred embodiment of a fast-positioning device for assembling blade brackets to a motor housing of a ceiling fan in the present invention, as shown in FIGS. 1, 2 and 3, includes a motor housing 10 and plural blade brackets 20 combined together.

The motor housing 10 has its underside provided with a round metallic plate having its inner circumference divided into five equal parts respectively formed thereon with a positioning plate 11 protruding downward. The positioning plates 11 are rectangular plates formed integrally with the motor housing 10 by compression and respectively formed with a long side 111 and a short side 112. The long sides 111 of the positioning plates 11 are radially and orderly arranged, based on the center of the motor housing 10. Further, two threaded holes 12 are respectively bored at a location adjacent to the opposite sides of each positioning plate 11.

The blade brackets 20 are respectively formed with a connecting portion 21 at one side corresponding to the motor housing 10. The connecting portion 21 of each blade bracket 20 has its front end cut with a positioning notch 211 matching with the positioning plate 11 of the motor housing 10. The positioning notch 211 is a through rectangular one to be horizontally fitted with the positioning plate 11 of the motor housing 10, letting the long side 111 and the short side 112 of the positioning plate 11 respectively push against the inner wall and the bottom of the positioning notch 211. Further, the positioning notch 211 of the blade bracket 20 has its opposite sides respectively bored with a through hole 212 aligned to the two threaded hole 12 of the motor housing 10, and two screws 22 are respectively inserted through the two through holes 212 of the blade bracket 20 and engaged with the two threaded holes 12 of the motor housing 20 for firmly assembling the blade bracket 20 on the underside of the motor housing 10.

In assembling, referring to FIGS. 1, 2 and 3, firstly, the motor housing 10 of the ceiling fan is secured on the lower side of a ceiling and the blade bracket 20 is laterally and horizontally moved to the motor housing 10 and has its positioning notch 211 quickly fitted on the positioning plate 11 of the motor housing 10, and at this time, the two through holes 212 of the blade bracket 20 are respectively and precisely aligned to the threaded holes 12 of the motor housing 10. Then, the two screws 22 are respectively inserted through the through holes 212 of the blade bracket 20 and secured in the threaded holes 12 of the motor housing 10 to firmly assemble the blade bracket 20 on the motor housing 10. When the blade bracket 20 is to be assembled, the blade bracket 20 is positioned sideward and moved to the motor housing 10 and has its positioning notch 211 horizontally and directly fitted on the positioning plate 11 of the motor housing 10, impossible to obstruct the worker's sight line. There fore, during assembling, the worker can clearly see the corresponding locations of the positioning notch 211 of the blade bracket 20 and the positioning plate 11 of the motor housing 10 and quickly assemble the blade brackets 20 on the motor housing 10, and thus the corresponding locking locations of the blade brackets 20 and the motor housing 10 can be completely aligned to each other.

A second preferred embodiment of a fast-positioning device for assembling blade brackets to a motor housing of a ceiling fan in the present invention, as shown in FIG. 4, includes a motor housing 10 and plural blade brackets 20. The motor housing 10 has its underside provided with a round metallic plate having its inner circumference divided into five equal parts respectively formed thereon with two positioning plates 13 separated from each other with a preset interval. The two positioning plates 13 are rectangular, formed integrally with the underside of the motor housing 10 by compression, respectively formed with a long side 131 and a short side 132, and the long sides 131 of the positioning plates 13 are radially and orderly arranged, based on the center of the motor housing 10. Further, a threaded hole 14 is bored at one side between the two positioning plates 13. The blade brackets 20 are respectively formed with a connecting portion 21 having its front edge cut with two through positioning notches 213 to be respectively fitted on the two positioning plates 13 of the motor shell 13. A through hole 214 is bored at one side between the two notches 213 of the blade bracket 20, corresponding to the threaded hole 14 of the motor housing 10 for a screw 23 to be inserted therethrough and engaged with the threaded hole 14 to firmly assemble the blade brackets 20 on the underside of the motor housing 10.

A third preferred embodiment of a fast-positioning device for assembling blade brackets to a motor housing of a ceiling fan in the present invention, as shown in FIG. 5, has almost the same structure as that described in the second preferred embodiment, except that two threaded holes 14 are bored at a location adjacent to the opposite sides of the two positioning plates 13. Each blade bracket 20 has the opposite sides of its connecting portion 21 respectively bored with a through hole 214 at a location corresponding to the threaded hole 14 of the motor housing 10. Two screws 23 are respectively inserted through the two through holes 214 and engaged with the threaded holes 14 for tightly assembling the blade bracket 20 on the underside of the motor housing 10.

As can be understood from the above description, this invention has the following advantages.

1. During assembling the blade bracket to the motor housing, the blade bracket is transversely and horizontally moved to the motor housing to have its positioning notch directly fitted on the positioning plate of the motor housing. Therefore, in the course of assembling, both the positioning notch of the blade bracket and the positioning plate of the motor housing can be seen clearly and fitted with each other quickly, and the corresponding locking locations of the motor housing and the blade bracket can be completely aligned to each other, able to assemble the blade bracket to the motor housing of the ceiling fan quickly and conveniently.

2. The positioning plates are formed integrally with the underside of the motor housing by compression, able to elevate producing efficiency and lower producing cost.

While the preferred embodiments of the invention have been described above, it will be recognized and understood that various modifications may be made therein and the appended claims are intended to cover all such modifications that may fall within the spirit and scope of the invention. 

1. A fast-positioning device for assembling blade brackets to a motor housing of a ceiling fan comprising a motor housing and a plurality of blade brackets, said motor housing having its underside divided into plural equal parts respectively secured thereon with one said blade bracket, said blade bracket secured on said motor housing by means of screws respectively inserted through corresponding locking locations of said blade bracket and said motor housing; said motor housing having its underside divided into plural equal parts respectively formed with at least one positioning plate protruding downward, each said positioning plates having a long sides radially and orderly arranged with respect to a center of said motor housing; and said blade brackets respectively formed with a connecting portion at a corresponding side of said motor housing, said connecting portion having its front end cut with at least one positioning notch, said positioning notch of said blade bracket horizontally and directly fitted on said positioning plate of said motor housing without obstructing worker's sight line, by mutual engagement of said positioning notch and said positioning plate, said blade bracket able to be quickly positioned on said motor housing, and the corresponding locking locations of said blade bracket and said motor housing able to be completely aligned to each other.
 2. The fast-positioning device for assembling blade brackets to a motor housing of a ceiling fan as claimed in claim 1, wherein the underside of said motor housing is a round metallic plate having its circumference divided into five equal parts respectively formed thereon with a positioning plate, which is a rectangular one formed integrally with the underside of said motor housing and protrudes downward, each said positioning plate formed with a long side and a short side, said long sides of said positioning plates radially and orderly arranged with respect to a center of said motor housing, said positioning notch of said blade bracket being a through rectangular notch to be fitted with said positioning plate of said motor housing.
 3. The fast-positioning device for assembling blade brackets to a motor housing of a ceiling fan as claimed in claim 1, wherein a threaded hole is bored at a location adjacent to opposite sides of said positioning plate on the underside of said motor housing, and said positioning notch of said blade bracket has its opposite sides respectively bored with a through hole, said two through holes of said blade bracket respectively aligned to said two threaded holes of said motor housing, two screwing elements respectively inserted through said two through holes and secured in said two threaded holes to firmly assemble said blade brackets on the underside of said motor housing.
 4. The fast-positioning device for assembling blade brackets to a motor housing of a ceiling fan as claimed in claim 1, wherein the underside of said motor housing is a round metallic plate having its circumference divided into five equal parts respectively formed thereon with two rectangular positioning plates protruding downward and formed integrally with the underside of said motor housing by compression, said two positioning plates separated from each other at a preset interval and respectively formed with a long side and a short side, said long sides of said positioning plates radially and orderly arranged with respect to a center of said motor housing, said connecting portion of said blade bracket having its front end cut with two through positioning notches to be respectivey fitted with said two positioning plates of said motor housing.
 5. The fast-positioning device for assembling blade brackets to a motor housing of a ceiling fan as claimed in claim 4, wherein the underside of said motor housing is bored with a threaded hole at one side between said two positioning plates, said through hole of said blade bracket aligned to said threaded hole of said motor housing, said blade bracket firmly fixed on the underside of said motor housing by means of a screw inserted through said through hole of said blade bracket and engaged with said threaded hole of said motor housing.
 6. The fast-positioning device for assembling blade brackets to a motor housing of a ceiling fan as claimed in claim 4, wherein the underside of said motor housing is bored with two threaded holes at a location adjacent to the opposite sides of said two positioning plates, and said connecting portion of said blade bracket has its opposite sides respectively bored with a through hole, said two through holes of said blade bracket aligned to said two threaded holes of said motor housing, said blade bracket fixed on the underside of said motor housing by means of two screws respectively inserted through said two through holes of said blade bracket and engaged with said two threaded holes of said motor housing. 